Hamburg is 4 hours behind Karachi
Best overlap: 12:00 PM to 6:00 PM in Karachi is 8:00 AM to 2:00 PM in Hamburg.
Plan around 12:00 PM to 6:00 PM in Karachi, which is 8:00 AM to 2:00 PM in Hamburg, to catch everyone during office hours. Hamburg is 4 hours behind Karachi, but with 6 hours of common ground you can hold morning or afternoon meetings without anyone working odd hours. Seasonal note: Hamburg uses daylight saving and Karachi doesn't, so double-check the times in your own months — they can move by an hour.